Product characteristics:

TCRT5000 infrared reflective sensor is adopted, which is a photoelectric sensor integrating emission and reception.
It is composed of an infrared light-emitting diode and an NPN infrared photoelectric triode.
The detection reflection distance of 1 mm to 25 mm is applicable.
The sensor is equipped with an M3 fixed mounting hole.
The adjustment direction and fixation are easy to use.
The wide voltage LM393 comparator is used.
The signal is clean, the waveform is good, and the driving ability is strong, exceeding 15 mA.
It can be used for robot obstacle avoidance, robot tracking of white lines or black lines, and can detect black lines in white background, as well as white lines in black background.
It is an essential sensor for line finding robots.
Pipelining piece counting, pulse data sampling of watt hour meter, paper detection of fax machine shredder and many other occasions.

When VCC (3.3V-5V) and GND are connected, the module power indicator will be on, and the infrared emitting diode of TCRT5000 sensor will continuously emit infrared rays.

When the emitted infrared rays are not reflected back or are reflected back but not strong enough, the infrared receiving tube will always be turned off.
At this time, the module output terminal is high, and the indicating diode will always be off;

Note:

Do not reverse the connections to burn the electronic components of the board.
Raspberry Pi players should set the I/O port of MCU as input mode/receiving mode, otherwise it cannot be used.
For other MCUs, or more advanced control boards such as ARM, if I/O ports need to be set to input/output mode, they must be set to input mode/receive mode, otherwise they cannot be used.
51 series microcontroller can be used directly without setting input/output mode.